Turkeyicon Creek, welcome to the forum. Pictures of your stock will help us.
The RSG in the silngwell can be either very faint or well struck, I have seen them both ways.
The RSG stocks often have numbers in the slingwell. I'm not sure, they must have been some kind of a code. I have a couple with differant numbers in the slingwell.
A pic of the P&D would be helpful. I have seen RP-D stamped on the bottom of the grip.
Is the cartouch, S'G' or S.G.?

Regards.....Frank